How To Compute Average Directional Index (ADX) using C#?

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using System;
using System.Collections.Generic;
using System.Linq;

namespace ADXCalculator
{
    class Program
    {
        static void Main(string[] args)
        {
            List<double> highPrices = new List<double> { 100, 102, 105, 98, 110, 115, 112, 108 };
            List<double> lowPrices = new List<double> { 95, 98, 101, 94, 105, 110, 108, 104 };
            List<double> closePrices = new List<double> { 98, 101, 104, 98, 108, 112, 110, 105 };

            int period = 14;

            List<double> positiveDMs = new List<double>();
            List<double> negativeDMs = new List<double>();

            for (int i = 1; i < highPrices.Count; i++)
            {
                double highDiff = highPrices[i] - highPrices[i - 1];
                double lowDiff = lowPrices[i - 1] - lowPrices[i];

                double positiveDM = highDiff > lowDiff && highDiff > 0 ? highDiff : 0;
                double negativeDM = lowDiff > highDiff && lowDiff > 0 ? lowDiff : 0;

                positiveDMs.Add(positiveDM);
                negativeDMs.Add(negativeDM);
            }

            List<double> trueRanges = new List<double>();

            for (int i = 0; i < closePrices.Count - 1; i++)
            {
                double trueRange = Math.Max(highPrices[i + 1] - lowPrices[i + 1], Math.Max(Math.Abs(highPrices[i + 1] - closePrices[i]), Math.Abs(lowPrices[i + 1] - closePrices[i])));
                trueRanges.Add(trueRange);
            }

            List<double> smoothPositiveDMs = new List<double>();
            List<double> smoothNegativeDMs = new List<double>();
            List<double> DXs = new List<double>();

            smoothPositiveDMs.Add(positiveDMs.Take(period).Sum() / period);
            smoothNegativeDMs.Add(negativeDMs.Take(period).Sum() / period);

            int j = 0;

            for (int i = period; i < positiveDMs.Count; i++)
            {
                smoothPositiveDMs.Add((smoothPositiveDMs[j] * (period - 1) + positiveDMs[i]) / period);
                smoothNegativeDMs.Add((smoothNegativeDMs[j] * (period - 1) + negativeDMs[i]) / period);

                j++;
            }

            for (int i = 0; i < smoothPositiveDMs.Count; i++)
            {
                double DX = Math.Abs((smoothPositiveDMs[i] - smoothNegativeDMs[i]) / (smoothPositiveDMs[i] + smoothNegativeDMs[i])) * 100;
                DXs.Add(DX);
            }

            double ADX = DXs.Take(period).Sum() / period;

            Console.WriteLine("ADX: " + ADX);
        }
    }
}